Trek Fuel EXe reviewed (finally)

by 56

The new Trek Fuel EXe is an important bike. It’s attracting a lot of attention from the e-curious who don’t think much of the current e-bike offering from elsewhere.

NB: Ignore the price tag of this model. Let’s talk about the bike behind the bling.

  • Brand: Trek
  • Product: Fuel EXe 9.9 XX1 AXS
  • Price: £13.250.00 £14,350
  • From: Trek Bikes
  • Review by: Benji for three months
trek fuel exe
Looks like a Trek Fuel EX

Three things I loved

  • Looks great
  • Less scary on technical terrain than heavier e-bikes
  • Rides like a normal bike

Three things I’d change

  • Range anxiety
  • Wish we’d tested a more affordable version
  • Rides like a normal bike
trek fuel e
Non-driveside shot

A warning. I’m not going to go into great detail about the nuts and bolts of this bike. You can read our ‘5 reasons the Trek Fuel EXe is most important bike of the decade‘ from when the Trek Fuel EXe was announced for that stuff.

Another warning. Nor am I going to talk much about this particular £14,350 showpiece model. It’s a distraction. It actually gets people’s backs up (mine included to be honest). It doesn’t give the Trek Fuel EXe concept a fair chance.

I’m going to focus on the frame, the motor, the battery and the controls. The stuff that’s exactly the same on the £6,400 Trek Fuel EXe 9.5.

In this review I’m going to focus purely on how a Trek Fuel EXe bike rides.

trek fuel e
Compact TQ motor

For those who do need a quick refresher, or understandably don’t want to click open another browser window for a reminder, the Fuel EXe is Trek’s mid-power e-bike. 50Nm of torque, compared to the 85Nm of full-power e-bikes and the 35Nm of Specialized’s SL low-power e-bikes.

The ostensibly similar – and surely the current main rival – Orbea Rise has 60Nm of torque by the way. And there’s also the new Fazua Ride60 equipped e-bikes with 60Nm too (check out the Pivot Shuttle SL as an example).

The battery is a 360Wh capacity one (same capacity as Orbea Rise). Some full-on ebikes have 700Wh+. A common capacity is 500-600Wh. Specialized SL e-bikes have 325Wh batteries.

There is also a range extender battery available for the Trek Fuel EXe which gives a further 160Wh, for £450. I would have really liked to have had one of these for this test period but they have yet to land in the UK in large enough numbers to get hold of one. Believe me, I tried.

Perhaps the two main USPs of this bike are its weight and its appearance. It weighs around 40lbs. And it looks like a normal mountain bike. Both of these factors cannot be understated as to their importance with the mountain bike market.

There is a third USP too but it’s only once you’re on the bike and riding that it appears: it is pretty much silent. Honestly, once off-road you can’t hear it. You can only just hear it when riding on the road but even then you have to be going pretty slow for the wind noise not to drown it out.

The Trek Fuel EXe can pass for a regular mountain bike. And while this might partially be about hiding the ‘shame’ of riding a pedal assist bike, I actually think it’s more to do with people’s existing fondness for their current mountain bike.

Existing experienced mountain bikers like how their mountain bike looks and sounds. The Trek Fuel EXe totally nails the remit of looking and sounding like a normal mountain bike. Massive kudo to Trek for that alone.

Trek Fuel EXe review

I’ll come out and say it. I still don’t really know how I feel about this bike. I’ve been dithering and delaying writing this review for quite some time. The only thing I am sure about is that the Trek Fuel EXe is not for me.

The thing is, I also think it is brilliant. And it will be perfect for loads and loads of riders out there.

In a nutshell, after passing it round as many other riders as I can convince to get on it, everyone says the same thing: “it’s just like a normal bike”. That is exactly what I say too, although I mean it in a confused head-scratching way. Everyone is saying it in a giddy enthused way.

Despite everything, the overarching experience of the Trek Fuel EXe is one of subtlety. It does not blow your mind upon first pedal stroke. Indeed because of the silence and the instant and super natural way the motor assist comes in, a lot of the time you can’t tell you’re getting any assistance at all. There isn’t a visual display confirmation of the assistance level you’re getting either (a la Shimano or Bosch displays).

It feels like not a lot is happening. But it is.

Finish a ride on the Trek Fuel EXe and then instantly hop on a normal mountain bike and the assistance is instantly noticeable by its absence. The Trek Fuel EXe is like riding with a massive tailwind. Or on ascents that have had a few degrees of gradient removed from them. Or you’ve suddenly become twenty years younger. It’s not that climbing becomes whistle-while-you-work easy (which it can do on full-power e-bikes), it’s still pretty strenuous activity on the Trek Fuel EXe.

I’d go as far to say that, unlike full-power e-bikes, the Trek Fuel EXe cannot do things that normal mountain bikes (and/or mountain bikers) can’t do. You won’t be scrabbling up preposterous trials-y techno climb challenges on the Fuel EXe. You won’t be trebling your usual altitude gain. What you will be doing is riding for that extra hour, and doing that extra hill.

What about descending then? Despite ‘only’ weighing 40lbs or so, the Fuel EXe does definitely exhibit some of the suspension flattery that you get with the extra weight of e-bikes. The Fuel EXe is an excellent descender. It’s pretty long and acceptably slack, which helps, but it’s the weight that is the most significant thing at play here.

The suspension on this bike works excellently. So calm. Very supportive. Very grippy. Sure, some of that may be due to the fancier dampers in the top-end suspension parts specced, but my gut feeling is that it’s to do with the sprung/unsprung help that comes when the frame is heavy, particularly the placement of that weight (central and relatively low down).

Compared to full-power (heavier) e-bikes on descents, the Trek Fuel EXe wins some and loses some. It does lose out on some of the super stability and speed-holding of heavier e-bikes. But on the whole, I think I prefer the nimbler handling of the Fuel EXe. Particularly when things are loose. It feels much less scary. Less like the bike is careering away out of control. More confidence inspiring.

Which brings us to the real surprise arena. Flat stuff.

The Trek Fuel EXe feels most at home on contouring terrain. Or rather, its assistance is more overly felt and appreciated on flatter trails. It’s when you’re not fighting gravity, or using gravity, that the Fuel EXe feels like a rocketship. It feels amazing. It makes you feel like a World Cup XC bod.

It’s also really good fun and capable on technical traverses. Off-cambers. Teetery stuff. Gamble do-you-don’t-you decisions. Ledges, Stream crossings. I felt much less fearful of stumbling and ending up being trapped under a bike, compared to the experience of full-power big-battery e-bikes.

A word here about the motor. They lack of delay is really, really impressive. There’s none of the fear of stopping pedalling (and the subsequent stall/dabbing) as there is with other e-bikes.


There’s also no detectable overrun either (where the motor is still assisting for a brief time even though you’ve stopped pedalling). Whilst some experienced e-bikers will miss the overrun (I did), there is no denying that the combination of instant engagement and instant disengagement really helps make the bike feel incredibly normal.

The controls and the display are fine. Totally intuitive and clear. Again, as an experienced e-biker I did miss the extra info of Shimano and Bosch (even Specialized) displays. But if you’ve never had the info, you’ll not miss it. Again, the Fuel EXe is not for experienced e-bikers. It’s very much a My First E-Bike.

Which bring us to the battery. And here I think there is a bit of an issue. Fundamentally I don’t think the battery is big enough to play to this bike’s strengths. Namely, big days out doing normal mountain biking. I’m not even that sure the aforementioned range extender battery will add enough extra range (for what and where I’d like to go anyway).

On one hand, the Trek Fuel EXe feels very much like a step into the future in terms of aesthetics and acoustics. On another hand, the return of range anxiety feels rather retro.

I appreciate that the whole battery capacity versus system weight is something of a vicious circle. Would adding one or two kilograms to the bike’s weight significantly impair the bike’s handling? Maybe it would. You do have to draw the line somewhere and it can’t have been an easy or quick decision made by the Trek team.

I think personal preferences come into play a great deal here too. I am a bit of a Boost* fan. I can’t help it. I don’t have the discipline to stay in Eco or Trail modes. With a different rider on board, one who switches to Eco for flat road linking sections, and keeps it in Trail for pretty much everything else.

(*Trek don’t actually give their three different power levels names, so I’m using the common e-bike parlance of Eco, Trail and Boost.)

The top power mode certainly does seem to really rinse the battery significantly more than you’d think. It doesn’t feel (there’s that word again) like it’s giving you that much more assistance, yet it certainly gets the battery bars dropping faster.

Ultimately, I did eventually end up doing rides pretty much keeping it in middle/Trail mode and just leaving Boost well alone. But is that like buying something and then putting it away and never using it? You’ve paid for a bit with 50Nm/300W of assist. Surely you should be able to use it?

Again, I’d like to point out that I haven’t had a range extender battery to test out to see what difference that makes to the Fuel EXe’s MPG.

I did use the top/Boost setting under certain circumstances. Those circumstances being going for a ‘Power Hour’. Those sort of sub-20km lunchtime blasts. Stick the bike in Boost and leave it there until you’re on fumes and need to Eco back home. That felt like a good use for Boost. And certainly opens up that short-but-intense type of ride that is pretty unique to e-bikes. Similarly, Boost was great for de-harshing and funning-up night rides (my night rides are always on the short side).


This may sound stupid obvious but if you only want a bit of help, that’s what this bike is for. It’s for normal rides. Normal riders. It is a very subtle bike. That subtlety is easily mistaken for being underwhelming. It’s arguably a waste of time to compare the Fuel EXe to full-power e-bikes. Trek do a full-power e-bike (a really ace one called the Trek Rail). Full-power e-bikes are like a new type of vehicle. The Fuel EXe is much closer to a regular unassisted mountain bike.

Fundamentally the Trek Fuel EXe is a beautifully executed machine that is going to be exactly what a great swath of experienced mtbers are looking for. Folk who are just finding mtbing too hard, but still want it to be strenuous. Something that takes the unpleasant edge off but doesn’t remove the ‘joys’ of Type 2 fun altogether.

Ignoring the motor aspect of it altogether, the ride and handling of the Trek Fuel EXe is brilliant. It’s a fantastic trail bike. Nimble and fun but with great stability and planted-ness.

Right. That’s my review finally done. Although I’d quite like this to be the start of an ongoing conversation about this bike. ‘Cos it’s interesting and I’m sure there are things I’ve not covered here.

Questions please! Comment below.


  • Frame // OCLV Mountain Carbon 140mm
  • Motor // TQ-HPR50, 50Nm, 300 watt peak power
  • Battery // TQ 360Wh
  • Head unit // TQ handlebar-mounted, TQ LED Display
  • Shock // RockShox Super Deluxe Ultimate AirWiz RCT2, 205 x 60mm
  • Fork // RockShox Lyrik Ultimate AirWiz Charger 3 RC2 150mm
  • Wheels // Bontrager Pro Line 30 OCLV Mountain Carbon
  • Front Tyre // Bontrager SE5 Team Issue 29 x 2.5in
  • Rear Tyre // Bontrager SE5 Team Issue 29 x 2.5in
  • Chainset // E*Thirteen E*Spec Race Carbon 34T 165mm
  • Shifter // SRAM Eagle AXS 12-speed
  • Rear Mech // SRAM XX1 Eagle AXS 12-speed
  • Cassette // SRAM Eagle XG-1299 10-52T
  • Brakes // SRAM Code RSC 200/200mm
  • Stem // Bontrager RSL Integrated bar/stem 45mm
  • Bars // Bontrager RSL Integrated bar/stem 820 x 27.5mm
  • Grips // Bontrager XR Trail Elite lock-on
  • Seatpost // RockShox Reverb AXS 170mm 34.9mm
  • Size Tested // L
  • Sizes Available // S, M, L, XL
  • Weight // 19.3kg

Geometry of our size L test bike

  • Head angle // 65º
  • Effective seat angle // 77º
  • Seat tube length // 435mm
  • Head tube length // 110mm
  • Chainstay // 440mm
  • Wheelbase // 1,245mm
  • Effective top tube // 630mm
  • BB height // 343mm
  • Reach // 485mm

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Viewing 16 posts - 41 through 56 (of 56 total)
  • Trek Fuel EXe reviewed (finally)
  • desperatebicycle
    Full Member

    Excellent review that. I’m amazed how much of the workding could be transalted to the Kinesis Rise Pro I owned for a short period. I bought it wxactly for the reasons Sanny suggests, I didn’t want to fly around on a new type of vehicle, I wanted a mountain bike that could assist me to ride more than my old body is capable of now.
    This section particulary:

    like riding with a massive tailwind. Or on ascents that have had a few degrees of gradient removed from them. Or you’ve suddenly become twenty years younger. It’s not that climbing becomes whistle-while-you-work easy (which it can do on full-power e-bikes), it’s still pretty strenuous activity on the Trek Fuel EXe.

    Aside from having no rear suspension (which made it quite a difficult bike to get used to) the Kinesis could fit that description.
    But yeah, as on page one the money side of things meant I had to sell it on, so much as I’d love a full-sus version of the bike I had…

    Full Member

    The Trek rationale for this says that the range extender has been sized at 160wh because that is the max size that is allowed in aeroplanes, so you can take your bike abroad, leaving the main battery at home of course, and still get some assisted riding in.

    Thats an interesting justification, but kind of ludicrous that you’d think about going to all the effort of flying with a bike to then have only a about 600m of climb in battery.

    Free Member

    Tell that to what must be dozens of folk I’ve seen riding sworks and plenty other 5 figure ebikes in the wild. Not just ‘1%ers’ buying them either.

    Surely that’s approaching the point of the guy on Question Time famously trying to claim that on £80k he was poor.

    Wow! That’s proper bonkers

    You sure?

    Figures, when you consider how much even a 6 year old car is worth now (at 70,000 miles it’s barely run in) it means the first, 2nd and even 3rd owners are buying them on finance. Whereas previously you needed an unsecured loan (at a higher rate) to get a 2nd hand car.

    And only a quarter on of the cars on the road are with their first owner (i.e. that £40k car is also a £20k, £10k and £5k car to someone else at 3/6/9/12 years old) so the figure isn’t representative of the average price anyone paid for their car.

    Disposable income is a funny thing. Once you’ve paid the bills to met your basic needs it builds up fairly quickly. A 5% pay rise for a lot of people is probably the difference between a Focus and a 3-series on finance outside of austerity/cost of living crisis / brexit . So it’s easy to see why people with a couple of hundred quid spare each month end up ‘buying’ a ‘premium’ car.

    I wonder how many of the optimistically prices 2nd hand e-bikes are because the owner owes that much on finance. The flipside of that disposable income increasing disproportionately with salary is it’s just as quickly erroded.

    Free Member

    Thats an interesting justification, but kind of ludicrous that you’d think about going to all the effort of flying with a bike to then have only a about 600m of climb in battery.

    I dunno – whenever I go away its always on a mostly uplift holiday, where we’ll be uplifted for most of the day with the odd bit of climbing, say 6000 feet of uplift and 2000 feet of self propelled climb, the battery would be perfect for that. Plus its actually not that bad to ride with no battery at all, not significant worse/heavier than the heavier end of the spectrum enduro bikes.

    Full Member

    I dunno – whenever I go away its always on a mostly uplift holiday, where we’ll be uplifted for most of the day with the odd bit of climbing, say 6000 feet of uplift and 2000 feet of self propelled climb, the battery would be perfect for that.

    I agree… I don’t quite understand who anyone who buys an Ebike then has to force the issue to do every climb, every day, sometimes it seems to me at the expense of enjoying the day. It’s like they’re at times trying to justify the purchase rather than just enjoying it.

    Full Member

    I don’t quite understand who anyone who buys an Ebike then has to force the issue to do every climb, every day, sometimes it seems to me at the expense of enjoying the day. It’s like they’re at times trying to justify the purchase rather than just enjoying it.

    Do you not want to go til you’re tired and spent when out on a regular bike?

    Full Member

    you’re only allowed a total of 160wh per person, so you’d need to get someone else in your party to carry any additional batteries


    Picking the last two airlines I used*, they both allow 2×160 wh batteries (as well as an unbelievable quantity of other batteries) to be carried, so there is carrier variation.


    *AirNZ and Virgin

    Free Member

    Thank you for an informative review. I am a recent owner of a 9.7 (a more modest SLX and Fox spec)

    I have a chronic health condition which means my days of long fast rides are long gone, but fortunately still have something left to give. Have previously owned a “full fat” ebike I want back to “acoustic”. I hated the weight, compromised handling and overpowered nature of the ebike. For me the lightweight, stealthy, quiet, well integrated battery and motor, incorporated in a frame the rides brilliant is amazing. Sure, it’s not like some ebikes; a big SUV like hyper powered bike. I have to put effort in. But it’s such a rewarding bike to ride and gives me a massive grin, and a pace a distance I’ve lost due to ill health. It’s as close as I will get to owner, riding fast an acoustic bike. Not all of us want long range and lots of power, we just want a morning of fun riding single track. This bike massively delivers on that.

    Free Member

    Wot wipeout said makes me happy 🙂

    Free Member

    OK….. so what makes this bike so *IMPORTANT* compared to something like the Orbea Rise?

    Full Member

    OK….. so what makes this bike so *IMPORTANT* compared to something like the Orbea Rise?

    Better marketing department.

    Free Member

    The motor makes this bike.

    I’ve ridden the Rise and it’s a great bike, but not as good. It’s noise and power delivery from the motor that makes the EXE the better bike. The TQ motor is much quieter. It is more responsive, less surge and less overrun. It’s a very natural riding experience. I reckon the Harmonic Pin-Ring gear will be much more reliable than the normal gearboxes. The motor is much smaller and so doesn’t compromise the frame design. Ebike or not the Trek Fuel EXe is a great trail bike because of that smaller motor.

    Full Member

    I don’t know whether the Trek is genuinely all that important or not, but I suspect it’s more impactful than the Rise for “death of a thousand cuts” type reasons.

    So the Rise is an ebike that looks very normal and non-ebikey, which is nice. The EXe does the same thing, but more betterer. The Rise, as nice as it looks, does have a fairly obvious motor in the bb area. The EXe just doesn’t really (or at least, you have to look hard to guess it’s there).

    And then there’s the acoustics: you can hear the motor on the Rise, but the EXe is (reportedly) pretty much silent. So again, it’s just that bit closer to a normal bike.

    Minor things, but maybe they add up, IDK. Plus, as STW said in their first look at the Exe, the fact that it’s from a big manufacturer is by itself a statement.

    Free Member

    but the EXe is (reportedly) pretty much silent.

    it really is near as damnit silent, its quite remarkable, and a very nice thing having ridden a bosch gen4 bike for the last 2 years. Its not just the lack of whining noise when pedalling, but there is no rattle from the motor when going downhill without pedaling like you get with the shimano ep8 (& ep8rs in the rise) & bosch gen 4.

    I still think the rise (especially in aluminium form) is the best value e mtb (not just out of the lightweights, but e mountain bikes as a whole) out there at the moment though .

    Free Member

    I haven’t read all the replies but another topic seemingly ignored in reviews is the battery life. Not how long it lasts on the ride, but how long until it needs replacing because it has degraded. Do the manufacturers have a recycling/replacement program? I have spoken to Orbea and apparently they don’t, whereas Trek seem to have thought about this and as far as I can tell, they have a system in place.

    If you can’t replace the battery, or have to go through the hassle of disposing of it (not that easy nowadays) then you are just storing up problems for yourself. Your LBS is not going to get involved so it is down to you.

    Food for thought when choosing a bike perhaps?

    Free Member

    replacement batteries are available (about £520 for the fuel exe) for most ebikes, I guess you’d keep the degraded battery as a kind of range extender for big days out – or thats what I would do. once its completely useless (to me) I’d take it to our local recycling place.

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